水位调控下分汊型河道淤积影响试验研究

为研究尾闾河道下游调控措施对上游各支汊河道泥沙淤积形态变化,进行了赣江尾闾河道悬沙淤积试验。试验结果表明,由于闸上调控水位抬升的影响,河道演变趋势由冲转淤。预计工程实施20年后主要淤积区域干流和西河位于西河上游赣江大桥到泥家洲附近的河道,平均淤积深度为1.10 m,东河中支位于中支赣江大桥到上房村之间的河道,平均淤积深度为1.48 m,东河南支位于豫章大桥到洲头村的河道,平均淤积深度为0.86 m。淤积主要集中在深槽以及河道凸岸下游区域,河道顶冲段受到堤防的限制,河势总体基本稳定;深泓线在水平方向和垂向均有所调整,垂向变化以抬高为主,水平方向的变化符合凹岸顶冲区冲刷,凸岸下游回流区淤积的一般规律。

Experimental Study on the Deposition of Bifurcated Channel Under Regulation

In order to analyze the changes of the siltation of the branches in the upper river under regulation of the lower reaches of the tail River, the suspended siltation experiment of the tail river of Ganjiang River is carried out. The experiment result shows that the evolution trend of river channel changes from erosion to deposition due to the influence of regulating water level rising on the sluice. The siltation is mainly concentrated in the deep channel and the downstream area of convex bank of the river. The top scour section of the river is limited by the embankment, and the river situation is basically stable. The thalweg is adjusted in both the horizontal and vertical directions. The vertical change is dominated by elevation. The change in the horizontal direction conforms to the general rule of the top scour area of concave bank and the siltation in the downstream return area of convex bank.